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<?php class C { public ?int $v = 123; } $x = new C; unset($x->v); $y = new C; $y->v = null; print @array_key_exists('v', $x); print @array_key_exists('v', $y);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, C given in /in/rH4p4:7 Stack trace: #0 {main} thrown in /in/rH4p4 on line 7
Process exited with code 255.

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